Quick answer
You only need a macerator when the en-suite can’t drain by gravity to a soil pipe. If the new toilet is too far from, or below the level of, the main soil stack, a macerator (or a pump for the basin and shower waste) carries it there through small-bore pipework. If gravity drainage can reach, a conventional waste is always the better, quieter, lower-maintenance choice.
What a macerator actually does
A macerator is a small unit that sits behind or beside the toilet. When you flush, it grinds the waste into a slurry and pumps it through a narrow pipe — typically just 22–32mm — up to a soil stack that could be several metres away and a floor or two higher. A separate pump can do the same for the lower-volume waste from a basin and shower. In short, it frees you from the tyranny of gravity, which is why it’s the enabler behind so many en-suites in places a normal waste pipe would never reach.
That’s the appeal: with a macerator you can put a WC under the stairs, in a loft conversion, in a converted box room, or against an internal wall miles from the existing drainage. It’s a genuinely useful piece of kit — but it’s a solution to a problem, not a default. We always look first at whether plain gravity drainage will do the job, because it always wins when it’s possible.
When you genuinely need one
In the Plymouth homes we work in, a macerator earns its place when the layout simply won’t allow a gravity fall. Typical cases:
- A loft conversion en-suite far above and away from the stack
- A toilet on a solid concrete floor where you can’t drop a waste pipe below
- An en-suite on the far side of the house from the existing soil pipe
- A WC under the stairs with no nearby drainage
- Period or solid-wall homes where chasing in a full waste run isn’t practical
When you don’t
If the new toilet sits reasonably close to the soil stack and you can achieve the required fall, skip the macerator. Gravity drainage is:
- Silent — no motor noise on every flush
- Lower maintenance, with nothing to break down
- More forgiving — no risk of blockage from wipes or debris
- Preferred by many buyers and surveyors
We hide the unit and pipework neatly, and leave easy access for the rare day it ever needs a look.
Living with a macerator
Modern macerators are far quieter and more reliable than the rattly units of twenty years ago, and a good one will run for many years. But they do ask for a little respect. The golden rule is simple: nothing down the toilet but the three Ps — pee, paper and poo. Wet wipes (even “flushable” ones), cotton buds, sanitary items and harsh chemicals are what cause nearly every breakdown we get called to.
They also need power, so the unit must be wired correctly by a qualified electrician — see our note on whether you need an electrician for a bathroom. We fit reputable brands, position the unit for easy access, and brief you on the do’s and don’ts at handover.
What it adds to the cost
A quality macerator unit itself is usually a few hundred pounds, with fitting and the small-bore pipework on top — so it’s a modest line on an en-suite quote rather than a budget-buster. The bigger cost question is usually how far the waste and water have to travel and how much building work the room needs. Because en-suites are compact, they often still come in well under a full family bathroom (£4,075–£10,870 in Plymouth, averaging around £6,340), and Plymouth runs roughly 9% below the UK average.
Whatever your room needs, you’ll get a single fixed written quote with the macerator (if needed) priced in — no mid-job surprises. It’s all part of our en-suite and cloakroom fitting service.
Common questions
Are macerator toilets noisy?
Modern units are much quieter than older ones — you’ll hear a short hum for a few seconds after flushing. We position the unit and box it in to keep the noise down.
Can a macerator handle a shower and basin too?
Yes. Many models take waste from a shower and basin as well as the toilet, or a separate small pump handles them. We size the unit to the room’s fittings.
Do macerators put buyers off?
A neatly fitted, reputable macerator that’s clearly there to enable an extra WC is rarely an issue — buyers value the extra bathroom more. Gravity drainage is still preferred where it’s genuinely possible.
Gravity first, pump if we must
Find out what your en-suite really needs
We’ll check whether your room can drain by gravity before reaching for a macerator — and price it honestly either way.